But on Monday's episode (10/9c, ABC), Gates' secret will come out when Castle (Nathan Fillion) and Beckett (Stana Katic) investigate the death of an emerging reality star from a Real Housewives-esque show. In the exclusive sneak peek below, the team tries to piece together clues from an episode of The Wives of Wall Street.

Before they can postulate a theory, Capt. Gates storms in to offer her take — all the while revealing her own giddy fandom. "It's the best show on TV!" she declares when questioned by an exasperated Castle. Unfortunately, for Rick, he again finds a way to put his foot in his mouth when he mentions the captain's "sophisticated taste" — or lack thereof! Watch the clip below to see how Gates reacts.Castle airs Mondays at 10/9c on ABC.